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serviceTemplate.ts
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serviceTemplate.ts
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/**
* The serviceTemplate module handles resolving any templated
* service configuration, allocating dynamic ports for services.
*/
import { makeLogger } from "./logging";
import { template } from "lodash";
import { ServiceSpec, ActiveServiceSpec } from "./service";
import { SequenceCmd, Health } from "./config";
import { getFreePorts } from "./util";
const logger = makeLogger("ServiceRunner", "RenderServiceTemplate");
/**
* Starts an installed service using the service configuration and manifest entry, and
* returns service configuration information.
*
*
* @param service - Templated spec of the service
* @returns The rendered version of the service configuration
*/
export async function renderService(service: ServiceSpec): Promise<ActiveServiceSpec> {
logger.debug(`rendering service config for ${service.name}`);
const ports = await getFreePorts();
const SERVICE_DIR = service.path;
const dynamicVar = { ...ports, SERVICE_DIR };
const renderArgs = (cmds: string[]) => cmds.map((cmd) => template(cmd)({ ...dynamicVar }));
const renderCmd = (cmd: string) => template(cmd)({ ...dynamicVar });
const renderSequenceCmd = (seqCmds: SequenceCmd[]) => seqCmds.map((cmd) => {
return {
args: renderArgs(cmd.args),
cmd: renderCmd(cmd.cmd),
};
});
const command = {
setup: renderSequenceCmd(service.commands.setup),
start: renderCmd(service.commands.start),
stop: renderCmd(service.commands.stop),
teardown: renderCmd(service.commands.teardown),
};
const args = {
start: renderArgs(service.args.start),
stop: renderArgs(service.args.stop),
teardown: renderArgs(service.args.teardown),
};
let health: Health | undefined;
if (service.health) {
health = {
...service.health,
port: renderCmd(service.health.port),
};
}
const rpcPort = template(service.rpcPort)({ ...dynamicVar });
logger.debug(`rendered service config for ${service.name}`);
return {
...service,
commands: command,
rpcPort,
health,
state: "pending",
args,
};
}